Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

PML Reflections of a 3D Gaussian Beam

Please login with a confirmed email address before reporting spam

Hello,
I'm trying to model a Gaussian beam of 845nm wavelength in a simple air domain with a spherical PML. However, before I continue with my model, the PML doesn't seem to be absorbing the beam properly and I'm seeing what appear to be reflections in the solved model. The relative electric field is not zero, despite there being nothing for the beam to interact with in the air domain, leading me to think that I'm not setting up the PML properly. I've tried adjusting the PML width, number of layers (I generally use about 5), and scaling factor but nothing has worked so far. Also, using a finer mesh for the PML swept mesh didn't have much of an effect either. Any suggestions would be greatly appreciated, I'm sure I'm missing something.

Thanks in advance,
Brendan


1 Reply Last Post 11 mars 2014, 15:30 UTC−4

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 11 mars 2014, 15:30 UTC−4
Are you sure what you saw is reflection rather than just numerical noise?

--
Pu, ZHANG
DTU Fotonik
Are you sure what you saw is reflection rather than just numerical noise? -- Pu, ZHANG DTU Fotonik

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.